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	<h1>Summary statistics</h1>
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	They perform statistical analyses on numeric data, including the computation of location measures such as the median and the average, the computation of statistical dispersions such as the inter quartile range and the range.
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		<li>Mean: computes the average of the records.</li>
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	    <li>Median: computes the value separating the higher half of a sample, a population, or a probability distribution from the lower half.</li>
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	    <li>Inter quartile range: computes the difference between the third and first quartiles.</li>
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	    <li>Range: computes the difference between the highest and lowest records.</li>
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